The difference between Israel having the nuclear and Iran is that Israel NEVER threatned any of its Middle Eastern self declared enemies with nuclear attack. Even when attacked and were in aq very tight spot, it still refrained from using it, always leaving the use of it as a very last resort. Iran, even not yet having it, already declares all intention to annihilate Israel. So given that they do get the nuclear weapon operational, with that deep embedded hatred to Jews, as Ahmadinejad portrays and declares, they will, no doubt use it. The declared Nuclear Weapon Club - USA, China,Russia, India, Pakistan, France and the UK - no one has ever threatned openly any other country in the world - Iran does, that is the difference, and that is the reason that nono of these club members trust Iran to join that "club".
One student killed, three wounded at Arizona campus during fight (a)
from the article: Ahmadinejad awaits a response